Pentacle on Black Onyx Earrings, 925 Sterling SilverSilver Pentacle on Black Onyx Disc Pendant 925 Sterling Silver. Striking appearance and a well made piece ~ a round disc of Black Onyx overlaid with a solid silver Pentacle, surrounded by a protective silver besel. It's a dramatic and empowering combination. The Pentacle symbolises balance and harmony of human consciousness with the elements of Nature ( Air, Fire, Water & Earth ) and is popular both as a protection charm and as a symbol for nature